CN112994759B - Cooperative relay D2D communication method based on OFDM - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/543—Allocation or scheduling criteria for wireless resources based on quality criteria based on requested quality, e.g. QoS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
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Abstract
The invention discloses a cooperative relay D2D communication method based on OFDM, which comprises the steps that a remote D2D pair carries out data relay communication through a special D2D pair, the special D2D pair multiplexes a plurality of resources and serves as relay equipment, and a plurality of available resources are utilized to carry out signal transmission based on OFDM; the frame structure of the communication system is divided into two time slots with equal length, the special D2D transmitter can send signals and receive relay forwarding signals in odd time slots, and the special D2D transmitter sends self transmission signals and forwards relay forwarding signals based on OFDM in even time slots. According to the invention, the D2D user is selected as the relay equipment of the remote D2D pair, so that the problem that D2D communication cannot be carried out due to distance limitation can be effectively solved, and the D2D access quantity of the system is effectively increased; the condition that one D2D multiplexes a plurality of cellular resources can be fully utilized through the OFDM technology, the utilization efficiency of the spectrum in the system is effectively improved on the premise of ensuring the special D2D communication quality serving as a relay, and the method has wide practical value and application prospect.
Description
Technical Field
The invention relates to wireless communication, in particular to a cooperative relay D2D communication method based on OFDM.
Background
With the rapid development of information technology and the explosive growth of the number of multimedia smart devices, and the online use of various multimedia applications, and accompanied with high requirements for communication service quality, delay and rate, the existing communication means and communication resources have difficulty in coping with and providing the real demands of users. D2D communication, which is one of the technical components of the 5G architecture, is a communication mode in which data transmission can be directly performed between a neighboring device and a device without data forwarding through a base station. As shown in fig. 1, D2D can directly perform short-distance communication for users by multiplexing cellular user resources, thereby greatly reducing the number of data processing and forwarding times of a base station, and greatly increasing the utilization rate of spectrum resources, thereby increasing the total throughput of the system, expanding the network capacity, reducing power consumption, and ensuring Qos of user communication.
The communication frequency band used by the D2D is a telecommunication authorized frequency band, and the base station can control the transmission power, the mode selection and the resource reuse of the user. The resource used by D2D communication may be a communication resource of a shared cellular user or may occupy a communication channel separately. In general, there are three communication modes for a D2D pair: dedicated mode, cellular mode, and shared mode (reuse mode), but shared mode is the most commonly used one, and the shared mode can greatly improve the spectrum utilization efficiency and improve the cell communication capacity.
In the multiplexing mode, the case of multiplexing resources can be classified into a one-to-one multiplexing mode and a many-to-one multiplexing mode. As shown in fig. 2, in the figure, the D2D users all adopt the multiplexing mode, the D2D _1 user multiplexes the resource of the cellular user CUE _1, and the D2D _2 and D2D _3 jointly multiplex the resource of the cellular user CUE _ 2. Compared with the one-to-one multiplexing mode, the many-to-one multiplexing mode can enable the system to accommodate more communication users, and further improves the spectrum utilization rate of the system. In the many-to-one resource multiplexing mode, the D2D users may perform resource multiplexing in a grouping manner, and the grouping may control interference among the D2D users in a group as small as possible. In the grouping process, some D2D pairs can perform resource multiplexing in multiple cellular user resource blocks, but in the actual multiplexing process, one D2D traffic multiplexing one resource block can complete the communication task, thereby causing spectrum waste in the system. The load of a base station can be reduced due to the short-distance direct communication of the D2D communication, but when the distance between the devices is relatively large, the communication quality of the two devices cannot be guaranteed, and even the two devices may not be connected, and the communication performance of the whole system is affected when available resources exist in the situation.
Disclosure of Invention
The invention aims to: the invention aims to solve the defects that D2D users cannot directly communicate due to long distance and the problem of frequency waste, and provides a cooperative relay D2D communication method based on OFDM, which improves the D2D access quantity of a system and ensures the communication quality of special D2D users.
The technical scheme is as follows: a cooperative relay D2D communication method based on OFDM is characterized in that a long-distance D2D pair carries out data relay communication through a special D2D pair, the special D2D pair multiplexes a plurality of resources and serves as relay equipment, and signal transmission is carried out by utilizing a plurality of available resources based on OFDM; a frame structure of a communication system is divided into two time slots with equal length, in odd time slots, the special D2D transmitter can send signals and receive relay forwarding signals, and in even time slots, the special D2D transmitter sends self transmission signals and forwards the relay forwarding signals based on OFDM.
Further, the cellular user normally communicates with the base station BS by using an uplink in all time slots, the common direct-connection D2D user normally multiplexes cellular resource communication in all time slots, the long-distance D2D transmitter sends signals in odd time slots and receives relay forwarding signals in even time slots; the special D2D pair serving as the relay uses one cellular resource to perform normal direct communication in odd time slots, uses another available multiplexing resource to receive the relay forwarding signal, and sends the self communication signal and the relay forwarding signal in even time slots.
Further, the long-range D2D transmitter sends information to the special D2D transmitter acting as a relay by multiplexing the special D2D pair pairable cellular resources at odd time slots.
Further, the special D2D transmitter acting as a relay uses two cellular resources simultaneously in odd slots, communicates normally on one resource, does not transmit on the other resource, receives only the signal from the far end D2D user and stores for retransmission in even slots.
Further, the special D2D transmitter serving as a relay simultaneously multiplexes two resource blocks that can be paired for signal transmission based on OFDM in even slots, and transmits signals to the long-distance D2D receiver and the special D2D receiver based on OFDM, respectively.
Further, the distant D2D receiver and the special D2D receiver receive the signal transmitted from the special D2D transmitter serving as a relay at even number of slots.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: the problem that D2D communication cannot be carried out due to distance limitation can be effectively solved by selecting the D2D user as the relay equipment of the remote D2D pair, and the D2D access quantity of the system is effectively increased; the OFDM technology can fully utilize the condition that one D2D multiplexes a plurality of cellular resources, and effectively improves the utilization efficiency of the spectrum in the system on the premise of ensuring the special D2D communication quality serving as a relay.
Drawings
Fig. 1 is a D2D communication link diagram under an LTE system;
FIG. 2 is a diagram of one-to-one and many-to-one resource reuse scenarios;
fig. 3 is a diagram of a D2D communication scenario in which a D2D user acts as a relay in the present invention;
FIG. 4 is a diagram illustrating a system information transmission scheduling frame structure according to the present invention;
FIG. 5 is a diagram of a cooperative relay D2D communication scenario based on OFDM in the present invention;
fig. 6 is a general model diagram of a cooperative relay D2D communication scenario based on OFDM in the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings and examples.
As shown in fig. 3, the D2D pair device is used as a relay device, and the D2D pair serving as a relay is called a special D2D pair, so that the intra-system spectrum resources can be effectively utilized and the number of system accessible communications D2D can be increased.
A system frame structure is divided into two time slots with odd-even alternation and equal length, cellular users normally use an uplink to communicate with a base station BS in all the time slots, ordinary direct-connection D2D users normally multiplex cellular resource communication in all the time slots, a long-distance D2D transmitter sends signals in odd time slots, and a long-distance D2D receiver receives relay forwarding signals in even time slots. The special D2D user serving as the relay uses one cellular resource to perform normal direct communication in odd slots, uses another available multiplexing resource to receive the relay forwarding signal, and sends the signal communication signal itself and the relay forwarding signal in even slots, as shown in fig. 4.
As shown in fig. 5, the OFDM-based cooperative relay D2D communication transmission scheme provided by the present invention is directed to a single cell communication scenario, where multiple cellular users and D2D users exist in a cell, the cellular users preferentially select resources, then the D2D performs resource multiplexing after effective grouping, when D2D pairs are grouped, one D2D pair may be paired with multiple cellular resources, but in an actual use process, it is specified that only one cellular resource can be multiplexed by one D2D pair, and in order to improve spectrum utilization, OFDM-based cooperative relay D2D communication is provided. As shown in fig. 6, for analysis of a cooperative relay transmission situation, a cell includes a base station, a pair of long-distance D2D pairs, and two D2D groups, which can be multiplexed by a special D2D pair (D2D _ 1) serving as a relay at the same time. The long-distance D2D can not carry out normal communication due to distance limitation, the special D2D transmitter serving as a relay receives signals sent by the long-distance D2D transmitter and forwards the signals to the long-distance D2D receiver, and meanwhile, the special D2D pair can also carry out normal communication. The dashed lines in the figure represent interfering signals. The following describes the procedure of the present scheme by taking the data transmission of the system in two time slots as an example.
(1) Odd number of time slots
Step 1: the long-distance D2D transmitter transmits information to the special D2D transmitter acting as a relay by multiplexing the special D2D pairable cellular resources at odd slots. As shown in fig. 6, the special D2D pair can multiplex the cellular resources of packet 1 and packet 2 simultaneously, and the long-distance D2D transmitter arbitrarily multiplexes one of the resources for data transmission S 0 The special D2D user multiplexes the remaining one resource to perform normal signal transmission S 1 。
Step 2: and the special D2D transmitter multiplexing the same resource at odd time slots and a long distance does not transmit signals, and only receives and stores signals from the far-end D2D users so as to forward the signals at even time slots. The special D2D transmitter receives the signal S transmitted from the long-distance D2D transmitter 0 And simultaneously, signals sent by other D2D transmitters in the cluster are received, except S 0 Besides signals, other signals are interference signals.
(2) Even number of time slots
And 4, simultaneously multiplexing two resource blocks which can be paired by the special D2D transmitter which acts as a relay in the even time slot through the OFDM technology for signal transmission. Respectively connecting to a long-distance D2D receiver and a special D2D receiver by an OFDM technologyReceiver transmit signal S 2 And S 3 . Through OFDM technology, the special D2D transmitter can simultaneously utilize cellular resources of a group 1 and a group 2, and can utilize orthogonal resources to transmit a signal S without mutual interference 2 And S 3 To both receivers.
Step 5 receives the signal transmitted from the special D2D transmitter acting as a relay at the even-slot long-distance D2D receiver and the special D2D receiver. Long-distance D2D receiver and special D2D receiver in receiving useful signal S 2 And S 3 Meanwhile, communication signals of other D2D users (D2D _2 and D2D _ 3) in the group are also received, and these signals can be regarded as interference signals to perform correct signal reception.
The embodiments of the present invention are described in detail with reference to the prior art, and the description thereof is not limited thereto. The invention is verified by repeated experiments, and obtains more satisfactory effect.
Claims (6)
1. A cooperative relay D2D communication method based on OFDM, characterized in that a long-distance D2D pair performs data relay communication through a special D2D pair, the long-distance D2D pair includes a long-distance D2D transmitter and a long-distance D2D receiver, the special D2D pair includes a special D2D transmitter and a special D2D receiver, the special D2D pair multiplexes a plurality of resources and serves as a relay device, and performs signal transmission using a plurality of available resources based on OFDM; a frame structure of a communication system is divided into two time slots with equal length, a special D2D transmitter can send signals and receive relay forwarding signals in odd time slots, and the special D2D transmitter sends self transmission signals and forwards the relay forwarding signals based on OFDM in even time slots.
2. The OFDM-based cooperative relay D2D communication method according to claim 1, wherein cellular users normally communicate with a base station BS using an uplink in all time slots, normal direct-connected D2D users normally multiplex cellular resource communication in all time slots, a long-distance D2D transmitter transmits signals in odd time slots, and a long-distance D2D receiver receives the relay forwarding signals in even time slots; the special D2D pair serving as the relay performs normal direct connection communication by using one cellular resource in the odd time slot, receives the relay forwarding signal by using another available multiplexing resource, and transmits a self communication signal and the relay forwarding signal in the even time slot.
3. The OFDM-based cooperative relaying D2D communication method according to claim 2, wherein the long-range D2D transmitter transmits information to the special D2D transmitter acting as a relay by multiplexing the special D2D pair pairable cellular resources at the odd slots.
4. The method of claim 3, wherein the special D2D transmitter acting as a relay uses two cellular resources simultaneously in the odd slots, communicates normally on one resource, does not transmit on the other resource, receives only signals from far-end D2D users and stores them for retransmission in the even slots.
5. The OFDM based cooperative relay D2D communication method according to claim 4, wherein the special D2D transmitter acting as a relay simultaneously multiplexes two resource blocks that can be paired for signal transmission based on OFDM in the even slots, and respectively transmits signals to the long-distance D2D receiver and the special D2D receiver based on OFDM.
6. The OFDM based cooperative relaying D2D communication method as claimed in claim 5, wherein the long range D2D receiver and the special D2D receiver receive the signal transmitted from the special D2D transmitter acting as a relay at the even numbered slots.
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| EP3235295B1 (en) * | 2014-12-19 | 2021-05-19 | Samsung Electronics Co., Ltd. | Apparatus and method for providing relay selection in device-to-device communication system |
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